Omega CDTX-90-3 Terminal Connections, Terminals 3-6 Loop Power, Loop Output Loop 2+ System Pwr

CDTX-90-3 Terminal Connections

Terminals 3-6: Loop Power

12-24 VDC ±10% system power and current loop output. Max. loop impedance:

50 Ω max. @ 12 V

325 Ω max. @ 18 V

600 Ω max. @ 24 V

6 Loop 2- 10 Output 2-

5Loop 2+

4	System Pwr		9	Output 2+
	Loop -
3	System Pwr		8	Output 1-
	Loop +
2	PowerAUX	-
1	PowerAUX	+	7	Output 1+

Terminals 11-14: Sensor input 11 is conductivity input

12is temperature input

13is the isolated signal ground

14is the sensor earth ground

14 Sensr Gnd (SHIELD)

Iso. Gnd

13 (BLACK)

Temp. IN

12 (WHITE)

Signal IN

11 (RED)

Terminals 1-2: Auxiliary power

Provides DC power to measurement circuit. Required for all CDTX-90 systems.

Terminals 7-10: Open-collector Outputs •Two transistor outputs, programmable as:

•High or Low setpoint with adjustable hysteresis

•proportional pulse (to 400 pulses per minute maximum)

•May be disabled (Off) if not used

Internal open-collector		Outputs
output circuit
S	15Ω	1	_	2

	D	+
Isolation

CDTX-90-3 System Power/Loop Connections

Stand-alone application, no current loop used

Connection to a PLC with built-in power supply

Transmitter

Terminals

Loop2-		6
Loop2+		5
Sys. Pwr.		4
Loop -
Sys. Pwr.		3
Loop +
AUX		2
Power -
AUX		1
	Power +

NC NC

Power Supply DC 12 - 24 V

-PowerSupply + PowerSupply

Transmitter

Terminals

Loop2-		6
Loop2+		5
Sys. Pwr.		4
Loop -
Sys. Pwr.		3
Loop +
AUX		2
Power -
AUX		1
	Power +

	PLC
	Terminals
-	Power Supply
	Ground
+	SupplyPower
-	Channel 2
	4-20 mA in
+	Channel 2
	4-20 mA in
-	Channel 1
	4-20 mA in
+	Channel 1
Internal PLC	4-20 mA in
Connection

Connection to a PLC/Recorder, separate supply

Example: Two transmitters connected to PLC/Recorder with separate power supply

Transmitter

Terminals

Loop2-	6
Loop2+	5
Sys. Pwr.	4
Loop -	3
Sys. Pwr.
Loop +	2
AUX
Power -	1
AUX
Power +

DC 12 - 24 V

-	SupplyPower
+	Power
	Supply

PLC or Recorder

-	Channel 2
	4-20 mA in
+	Channel 2
	4-20 mA in
-	Channel 1
	4-20 mA in
+	Channel 1
	4-20 mA in

	Loop2-		6
2	Loop2+		5
Transmitter
	Sys. Pwr.		4
	Loop -			DC 12 - 24 V
	Sys. Pwr.		3
		Loop +
				-	Power
	AUX
			2		Supply
	Power -
				+	Power
	AUX		1
					Supply
	Power +
				PLC or Recorder
	Loop2-		6
1				-	Channel 4
	Loop2+		5
Transmitter				+	Channel 4
				-	Channel 3
	Sys. Pwr.		4
	Loop -			+	Channel 3
	Sys. Pwr.		3	-	Channel 2
		Loop +		+	Channel 2
	AUX
			2	-	Channel 1
	Power -

AUX power required for all CDTX-90 systems.

		+	Channel 1
AUX	1
Power +

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